What the Supreme Court's Sony v. Cox Decision Means for Copyright Enforcement
By Leslie Hughes & Nancy Wolff
What was the dispute?
More than 50 record labels, led by Sony Music Entertainment, sued Cox Communications, arguing that Cox knowingly allowed subscribers to engage in repeated music piracy despite receiving hundreds of thousands of infringement notices. A Virginia jury found Cox liable for contributory copyright infringement and awarded approximately $1 billion in statutory damages. The Fourth Circuit Court of Appeals later upheld the contributory liability finding but overturned a separate finding of vicarious liability.
What did the Supreme Court decide?
On March 25, 2026, the U.S. Supreme Court unanimously (9-0) ruled in favor of Cox.
The Court held that:
Simply providing internet service is not enough to create contributory copyright liability.
Knowing that some subscribers may be infringing copyrights is not enough.
A service provider must intend for its service to be used for infringement.
In most cases, that intent requires evidence that the provider actively encouraged, induced, or promoted the infringing activity.
Justice Clarence Thomas wrote that Cox did not encourage piracy and did not provide a service designed primarily for infringing uses. As a result, Cox could not be held contributorily liable for the actions of its subscribers.
Justice Sonia Sotomayor agreed that Cox should prevail but suggested that other forms of secondary liability may still be available in future cases.
Why is this significant?
The decision narrows the circumstances under which internet service providers and other technology intermediaries can be held liable for copyright infringement committed by their users.
Before this ruling, many copyright owners hoped that repeated infringement notices, combined with a provider's failure to terminate users, could support liability. The Supreme Court rejected that approach and instead focused on whether the provider intended to facilitate infringement.
For technology companies, the ruling is viewed as a major victory because it raises the legal standard for holding internet infrastructure providers responsible for user activity.
What questions remain unresolved?
The Court's decision was relatively narrow and leaves several important questions unanswered, including:
How courts will evaluate platforms that actively host, recommend, curate, or distribute user content.
Whether other forms of secondary liability may apply in different circumstances.
What obligations service providers may have when they receive repeated infringement notices.
Current status
The Supreme Court's decision effectively ended Sony's billion-dollar contributory infringement claim against Cox. The ruling is now binding nationwide and is expected to influence other copyright cases involving internet service providers and technology platforms.
Why should DMLA members care?
While the ruling is a significant victory for technology platforms and infrastructure providers, it creates challenges for copyright owners and content licensors.
The decision:
Removes an important enforcement tool against large intermediaries.
Makes it more difficult to pursue well-funded defendants when direct infringers are difficult to identify or collect from.
May increase pressure for legislative reforms to the DMCA and copyright enforcement systems.
Not everyone views the decision as a simple clarification of copyright law. The Court may have significantly narrowed long-established theories of contributory infringement that courts have relied upon for decades.
Critics note that Congress intentionally left room for courts to develop common-law theories of secondary liability when it enacted the Copyright Act of 1976. They argue that the Act's exclusive rights—including the right to authorize the use of copyrighted works—have historically supported claims against parties that knowingly facilitate infringement.
Whether the Cox decision is interpreted narrowly, as applying primarily to internet service providers, or more broadly as limiting contributory infringement claims in other contexts, remains to be seen. Rights holders have already expressed concern that online platforms may view the ruling as reducing their obligation to respond to infringement notices.
In addition, OpenAI recently filed a Motion for Judgment on the pleadings (relating to all its cases involving its AI platform) arguing the recent Supreme Court decision in Cox has significantly narrowed the standard for contributory infringement, abrogating the long established test of “knowledge plus material contribution” theory.
As future cases work their way through the courts, Congress may also face renewed calls to strengthen copyright enforcement tools or clarify the scope of secondary liability under the Copyright Act.
From a copyright policy perspective, this is one of the most important U.S. copyright liability decisions involving internet infrastructure providers. The ruling is likely to influence future debates involving AI platforms, hosting services, search technologies, and other intermediaries accused of facilitating infringement.